891300021 has 8 divisors (see below), whose sum is σ = 1258305984. Its totient is φ = 559247040.

The previous prime is 891300019. The next prime is 891300103. The reversal of 891300021 is 120003198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 891300021 - 2¹ = 891300019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891299964 and 891300000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891300121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8738185 + ... + 8738286.

It is an arithmetic number, because the mean of its divisors is an integer number (157288248).

Almost surely, 2^891300021 is an apocalyptic number.

It is an amenable number.

891300021 is a deficient number, since it is larger than the sum of its proper divisors (367005963).

891300021 is a wasteful number, since it uses less digits than its factorization.

891300021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17476491.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 891300021 is about 29854.6482310544. The cubic root of 891300021 is about 962.3682922271.

The spelling of 891300021 in words is "eight hundred ninety-one million, three hundred thousand, twenty-one".